Chitterspitter is a rare Artifact card from Modern Horizons 2 (MH2), collector number 153. Current market price: $0.44 (foil $0.78), TCGplayer market prices via Scryfall.
At the beginning of your upkeep, you may sacrifice a token. If you do, put an acorn counter on this artifact. Squirrels you control get +1/+1 for each acorn counter on this artifact. {G}, {T}: Create a 1/1 green Squirrel creature token.